build(deps): Update if-watch requirement from 1.1.1 to 2.0.0

Updates the requirements on [if-watch](https://github.com/mxinden/if-watch) to permit the latest version.
- [Release notes](https://github.com/mxinden/if-watch/releases)
- [Changelog](https://github.com/mxinden/if-watch/blob/master/CHANGELOG.md)
- [Commits](mxinden/if-watch@v1.1.1...v2.0.0)

---
updated-dependencies:
- dependency-name: if-watch
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

protocols/mdns/Cargo.toml

@@ -15,7 +15,7 @@ async-io = "1.3.1"
 data-encoding = "2.3.2"
 dns-parser = "0.8.0"
 futures = "0.3.13"
-if-watch = "1.1.1"
+if-watch = "2.0.0"
 lazy_static = "1.4.0"
 libp2p-core = { version = "0.35.0", path = "../../core", default-features = false }
 libp2p-swarm = { version = "0.38.0", path = "../../swarm" }

transports/tcp/Cargo.toml

@@ -14,7 +14,7 @@ categories = ["network-programming", "asynchronous"]
 async-io-crate = { package = "async-io", version = "1.2.0", optional = true }
 futures = "0.3.8"
 futures-timer = "3.0"
-if-watch = { version = "1.1.1", optional = true }
+if-watch = { version = "2.0.0", optional = true }
 if-addrs = { version = "0.7.0", optional = true }
 ipnet = "2.0.0"
 libc = "0.2.80"